ʻEpekema

Ke Hoʻomaopopo nei i ka Mamao
ʻO ka mamao ka lōʻihi o ke ala i hele ʻia e kahi mea. He nui scalar ka mamao, he nui kino nona ka nui wale nō a ʻaʻohe kuhikuhi. ʻO ke anakahi honua o ka mamao ʻo ka mika, i hoʻopōkole ʻia ʻo m. ʻO ka hōʻailona no ka mamao ʻo s.

Ka Wehewehena o ka Neʻe ʻana
ʻO ka neʻe ʻana ka loli o ke kūlana o kahi mea. He nui vector ka neʻe ʻana, he nui kino nona ka nui a me ke kuhikuhi. Hiki ke hōʻike ʻia ke kuhikuhi o ka neʻe ʻana ma ke ʻano he kuhikuhi cardinal (ʻākau, hikina, hema, komohana, a pēlā aku) a i ʻole e hoʻohana i nā huaʻōlelo hema, ʻākau, luna, a i ʻole i lalo.

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Ke kānāwai o ka mālama ʻana i ka momentum angular ua ʻōlelo ʻia inā ka hopena o ka ikaika i loko o kahi mea paʻa e wili ana, ʻo ka waiwai he zero a laila ka ikaika kihi He mea paʻa i ka neʻe ʻana o ka wili mau. Hiki ke loaʻa ke ʻano no ke kānāwai o ka mālama ʻana i ka momentum angular ma ke ʻano makemakika ma ka hoʻololi ʻana i ke ʻano no ke kānāwai ʻelua o ka neʻe ʻana o Newton no ka momentum angular.

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Inā he ikaika hopena ma luna o kahi mea me ka nuipaʻa m, a laila neʻe ka mea ma kahi laina pololei me ka wikiwiki a. Hōʻike ʻia ka pilina ma waena o ka ikaika hopena, ka nuipaʻa a me ka wikiwiki ma o ka hoohalike:

ʻO kēia ke kaulike o ke kānāwai ʻelua o Newton i aʻo ʻia ma ka papa X.

Ua like ka nui kino i ka neʻe ʻana o ka wili me ka ikaika hopena ma neʻe pololei is ka hopena o ka ikaikaUa like ka nui kino i ka neʻe ʻana o ka wili me ka nui ma ka neʻe pololei ʻana manawa o ka inertiaUa like ka nui kino i ka neʻe ʻana o ka wili me hoʻolalelale ma ka neʻe pololei ʻana hoʻolalelale kihi.

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1. Kaila hoʻomalu
Inā like ka hana i hana ʻia e kahi ikaika i ka wā e hoʻomaka ai kahi mea e neʻe mai kona kūlana mua a hoʻi ka mea i kona kūlana mua me ka ʻole, a laila ua kapa ʻia ka ikaika he ikaika conservative.
Eia kekahi mau laʻana o nā kaila conservative.

1.1. Ka umekaumaha
E noʻonoʻo i kahi mea e neʻe ana i luna a hiki i kona kiʻekiʻe loa a laila neʻe i lalo i kona kūlana mua. I kona neʻe ʻana i luna i kahi mamao h, aia ka ikaika o ke koʻikoʻi ma ke kuhikuhi ʻē aʻe i ka neʻe ʻana o ka mea. No ka mea aia ia ma ke kuhikuhi ʻē aʻe i ka neʻe ʻana o ka mea, hana ka ikaika o ke koʻikoʻi i ka hana maikaʻi ʻole ma luna o ka mea.
W = wh cos (180^o) = – wh = – mgh

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ʻO ka friction static ka ikaika friction e hana ana ma luna o nā ʻili o nā mea e pili ana kekahi i kekahi ke neʻe ʻole nā ​​​​mea.

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ʻO ka friction kinetic ka ikaika friction e hana ana ma luna o nā ʻili o nā mea e pili ana kekahi i kekahi ke neʻe nā mea.
Inā makemake ʻoe e hoʻoholo i ka ikaika friction static, e hoʻohana i ka hoohalike 1.5 a. Inā makemake ʻoe e hoʻoholo i ka coefficient friction kinetic, e hoʻohana i ka hoohalike 1.5 b.

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Mea Ikehu Kinetic i ka Neʻe Rotational

Loaʻa i nā mea e neʻe ana ma kahi laina pololei ikehu kinetic hiki ke helu ʻia me ka hoʻohana ʻana i ke ʻano hana:
EK = ½ mv²
ʻIkepili:
EK = ikehu kinetic (ʻo nā anakahi honua he kg m²/s² a i ʻole Joule)
m = ka nuipa (ʻo ke anawaena honua he kilokani, i hoʻopōkole ʻia kg)
v = ka wikiwiki (ʻo ke anawaena honua he mika/kekona, i hoʻopōkole ʻia m/s)
Ua like ka nui kino i ka neʻe ʻana o ka wili me nuipa (m) ma neʻe pololei is manawa o ka inertia (I)Ua like ka nui kino i ka neʻe ʻana o ka wili me wikiwiki (v) i ka neʻe ʻana o ka wili ʻana ka wikiwiki kihiNo laila, he ikehu kinetic ko kahi mea e wili ana e hiki ke helu ʻia me ka hoʻohana ʻana i ke ʻano hana:

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Mea Hana Ikehu Kinetic a me ke Kino

Inā hana ka ikaika ʻupena ma luna o kahi mea, ʻike ka mea i ka wikiwiki (a me ka neʻe ʻana). Ke ʻike ka mea i ka wikiwiki, loli kona wikiwiki. Hiki ke ʻōlelo ʻia ua pili ka hana i hana ʻia e ka ikaika ʻupena i nā wikiwiki mua a me ka wikiwiki hope o ka mea.
ʻO ka hana i hana ʻia ma luna o kahi mea e ka ikaika holoʻokoʻa mau:
Ka huina o ka hoʻoikaika (W) = Ka ikaika hopena (F huina) x ka neʻe ʻana (s)
ʻŌlelo ke Kānāwai ʻElua o Newton inā he ikaika holoʻokoʻa e hana ana ma luna o kahi mea, e ʻike ka mea i ka hoʻolalelale.

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9 mau laʻana o nā nīnau ʻoihana

1. Hoʻopili ʻia kahi ikaika o 20 Newtons i kahi poloka a hiki i ka neʻe ʻana o ka poloka i kahi mamao o 2 mika. ʻO ka hana i hana ʻia e ka ikaika F ma ka poloka…
Pahana
Ua ʻike ʻia :
Ikaika (F) = 20 N
Ka neʻe ʻana (s) = 2 mika
Huina = 0 (ua like ke kuhikuhi o ka ikaika me ke kuhikuhi o ka neʻe ʻana a i ʻole kūlike ke kuhikuhi o ka ikaika me ke kuhikuhi o ka neʻe ʻana i ʻole ke kihi i hoʻokumu ʻia e ka ikaika a me ka neʻe ʻana he ʻole)

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ʻO ke kūlana mua no ke kaulike o ke kino paʻa :
ʻŌlelo ke Kānāwai ʻElua o Newton inā ʻaʻole like ka ikaika hopena e hana ana ma luna o kahi mea (ua manaʻo ʻia ka mea he ʻāpana) me ka ʻole, a laila e neʻe ka mea me ka wikiwiki mau kahi e like ai ke kuhikuhi o ka neʻe ʻana o ka mea me ke kuhikuhi o ka ikaika hopena. Inā ʻole ka ikaika hopena, a laila ua hoʻomaha ka mea a i ʻole ke neʻe nei ka mea ma ka wikiwiki mau.

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